JP2001521609A - Disc brake and brake pad set for disc brake - Google Patents

Abstract

(57) [Summary] A disc brake having two brake pads (4, 6) which are arranged on opposite sides of the brake disc (2) and which can be pressed against the brake disc (2) during braking. The brake pads (4, 6) include a carrier plate (8) and a friction lining layer (10, 12) disposed thereon, and the friction lining layer (10, 12) has a reduced thickness region (14, 16,). The brake pads (4, 6) arranged on each side of the brake disc (2) are provided with reduced thickness areas (14, 20) of the friction lining layers (10, 12) arranged on opposite sides. They are arranged asymmetrically with respect to (16, 18, 20).

Description

Detailed Description of the Invention disc brake and the brake pad set Technical Field The present invention for a disc brake, as described in the preamble of claim 1 and claim 2, relates to a brake pad for disc brakes and disc brakes. BACKGROUND ART Such disc brakes are required in the field of transportation equipment (vehicles). Generally, the friction lining having the inclined surface is fixed to the carrier plate of the brake pad, that is, the friction lining does not have a surface extending parallel to the brake disk or the carrier plate. The brake pads fixed to both sides of the disc brake are provided with friction linings having inclined surfaces that are mirror-inverted (plane symmetric) with each other. The disc brake is a complex vibration system, and the vibration system is excited by the frictional force generated at the contact surface between the friction lining and the brake disk. One of the vibration problems is the squeaking of the brakes. This phenomenon is due to low frequency vibrations of about 20-150 Hertz that occur when changing from close to frictional conditions, and occurs in very slow vehicles. High-duty vehicles are equipped with an automatic gearbox in which drive torque is constantly applied to the drive shaft, so that squeaking of the brake is particularly likely to occur. In the past few years, the problem of vibration has also been increasing in the automotive field. One reason is the idea of lightweight construction and cost reduction. Consumers, on the other hand, want cars that are more comfortable and have less unpleasant driving noise. The so-called slipstick effect is considered to be the cause of the squeak noise. The slip stick effect is that the close contact and slippage between the friction lining and the brake disc occur alternately. Squeaks occur in two different situations. One typical case is when high-duty vehicles with automatic gearboxes frequently occur and the drive torque on the brakes is released. If a brake is applied to the vehicle and a drive torque is generated on the drive shaft, and the brake is released slowly, a clear audible noise and a strong beat sound are generated. The driving torque is not necessarily generated by the engine, but is also generated by gravity generated when the vehicle is traveling downhill. In this case, too, the torque is slowly released and a squeaking noise is emitted when the brake lining reaches a certain contact pressure. The beating noise described above may occur when the vehicle moves at a constant slow speed and a constant contact pressure lasts for a certain time. Even when a brake is applied during high-speed running, when the vehicle suddenly changes from friction to close contact before stopping, a squeak sound that can be recognized may be generated. An object of the present invention is to provide a disc brake and a brake pad set for a disc brake which can remove low-frequency noise. According to the invention, the above-mentioned object is achieved by the features of claim 1 or claim 2. The present invention provides a preferred method of friction lining of a brake pad, wherein the brake pad has a reduced thickness portion, and the reduced thickness portion is not symmetric (mirror-reversed) in the brake pad with respect to the brake disc. Is formed. Since the friction lining on the surface of the brake disk is not mirror-reversed (plane symmetry), different frictional forces are generated on both surfaces of the brake disk, and different vibrations are induced on both surfaces of the brake disk, and the vibration is self-excited. As a result, the occurrence of low frequency vibrations within the frequency from 150 Hz and at certain resonance phenomena is suppressed. The inclined friction lining is arranged such that the reduced thickness portion is inclined toward the carrier plate side, for example, at an angle of 10 ° to 45 °, and contacts the outside in the direction of the carrier plate. The boundary line between the area of the friction lining layer having a uniform thickness and the reduced thickness portion extends parallel to the radially extending bisector (center line) of the brake disc, or the above bisector (center line). ) At a certain angle. The angle of the bisector (center line) can be set between ± 0 ° and 60 °, and preferably between ± 10 ° and 30 °. Note, for example, that if the pair of brake pads are located on opposite sides, the above-mentioned boundaries extend in opposite directions on both sides of the brake disc and are therefore not mirror symmetric. Further preferred embodiments are set out in the dependent claims. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a brake pad set for a brake disc according to a first embodiment provided with brake pads, and is shown in a state of being spread outward by 90 ° in the plane of FIG. Have been. FIG. 2 shows a brake pad on the piston side. FIG. 3 supplements the brake pad shown in FIG. 4 and 5 show another embodiment of the present invention. DESCRIPTION OF THE INVENTION In FIG. 1, a brake disc 2 rotating during running is arranged between brake pads 4,6. The brake pads 4, 6 are originally located in a position parallel to the brake disc 2, but are shown bent 90 degrees outward (spread) to show the friction lining surface. The friction lining of each brake pad 4, 6 has a central region 22 of constant thickness or of a slight outward reduction. Although not shown, the surface of the friction lining in the central region 22 is slightly inclined to prevent metal noise caused by friction due to shift of the center of pressure. The friction lining layers 10, 12 include, at the ends of the brake pads 4, 6, reduced thickness areas 14, 16, 18, 20 which, in the brake pads 4, 6, correspond to the brake disc 2. The mirrors (opposing surfaces) extending in the longitudinal direction are arranged asymmetrically with respect to the plane. This prevents self-excitation of the braking vibration, which is particularly effective in the frequency range of about 20-150 Hertz. The inclined surfaces of the friction linings arranged on opposite sides (opposing positions) are arranged in a different manner in this way, and scoring of the brake disc 2 which may occur when the friction linings are arranged mirror-inverted (plane symmetric). Is prevented. The slip stick phenomenon known as the squeaking noise of the brake due to the simultaneous tilting of the friction lining in a low-speed vehicle is reliably prevented. 2 and 3 show a pair of brake pads, FIG. 2 shows a brake pad on the piston side, and FIG. 3 shows an opposite brake pad. In this embodiment, the slope of the reduced thickness region extends at an angle of 20 ° to the friction lining surface in the central region 22 or the carrier plate 8. The slope of the regions 14, 16, 18, 20 can be set in the range of about 10-45 °. The boundary between the central region 22 of the friction lining layers 10 and 12 and the thickness reduction region extends at an angle of about ± 22 ° with respect to the radially symmetric bisector (center line) 28 of the brake pads 4 and 6. . The boundary line can be set within a range of ± 0 to 60 °, and preferably within a range of ± 10 to 30 °. FIG. 4 shows another embodiment of the brake pad on the opposite side (from the piston), the cross-section indicated by hatching extending perpendicular to the bisector (center line) 28. FIG. 5 shows the brake pad pair of FIG. 4 in a manner similar to FIG.

[Procedure of Amendment] Article 184-4, Paragraph 4 of the Patent Act [Date of Submission] July 29, 1998 (July 29, 1998) [Details of Amendment] Claims 1. A disc brake having two brake pads (4, 6) arranged on opposite sides of the brake disc (2) and being pressed against the brake disc (2) during braking, , 6) comprises a carrier plate (8) and a friction lining layer (10, 12) disposed thereon, the friction lining layer (10, 12) comprising a central region (22) of uniform thickness and a brake pad (4). , 6) at least at one end of the brake disc (2) and a reduced thickness area (14, 16, 18, 20, 20) arranged tangentially to the brake disc (2), and a brake pad ( 4, 6) are arranged asymmetrically with respect to the reduced thickness regions (14, 16, 18, 20) of the friction lining layers (10, 12) arranged on opposite sides, and have a low frequency of up to 150 Hz. For the purpose of preventing vibration, A boundary line (24) between the central region (22) and at least one of the thickness reduction regions (14, 16, 18, 20) is formed by a brake pad (4, 6) extending radially of the brake disc (2). It extends at an angle of ± 0 to 60 ° with respect to the bisector (28), preferably at an angle of ± 10 to 30 °; and furthermore, a boundary line of the brake pads (4, 6) arranged on opposite sides ( 24) are facing in opposite directions. 2. A brake pad set including two brake pads (4, 6) disposed on opposite sides of the brake disk (2) and capable of being pressed against the brake disk (2) during braking. 4, 6) comprise a carrier plate (8) and a friction lining layer (10, 12) disposed thereon, the friction lining layer (10, 12) comprising a central region (22) of uniform thickness and a brake pad ( A brake pad arranged on each side of the brake disc (2), comprising at least one end of each of the brake discs (4, 6) and a reduced thickness area (14, 16, 18, 20) arranged tangentially to the brake disc (2). (4, 6) are arranged asymmetrically with respect to the reduced thickness regions (14, 16, 18, 20) of the friction lining layers (10, 12) arranged on opposite sides, and have a low frequency of up to 150 Hz. For the purpose of preventing frequency vibration A boundary line (24) between the central region (22) and at least one of the reduced thickness regions (14, 16, 18, 20) extends radially of the brake disc (2); Extend from the angle bisecting line (28) at an angle of ± 0 ° to 60 °, preferably ± 10 ° to 30 °; (24) are opposite to each other. 3. 3. The device according to claim 1, wherein the surface of the thickness-reduced region is circumscribed toward the carrier plate and is downwardly inclined at an angle of about 10 to 45 degrees. Extending in the direction. 4. 4. The device according to claim 1, wherein each of the brake pads is arranged symmetrically with respect to a bisector (center line) extending radially of the brake disc. And a plurality of reduced thickness regions (14, 16, 18, 20). 5. 4. The device according to claim 1, wherein the reduced thickness region (14, 16, 18, 20) is arranged at least at one end of the brake pad (4, 6) in the tangential direction of the brake disc (2). Are located in 6. 6. The device according to claim 1, wherein the thickness-reduced areas (14, 16, 18, 20) of the brake pads (4, 6) are arranged with respect to the direction of rotation of the brake disc (2). It is located at the discharge end (30, 32).

Claims (1)

[Claims] 1. The brake discs (2) are arranged on opposite sides of the brake disc (2).   It has two brake pads (4, 6) arranged so as to be pressed against the disc (2).   The brake pads (4, 6) are the carrier plates (8)   And a friction lining layer (10, 12) disposed thereon.   The lining layers (10, 12) have reduced thickness regions (14, 16, 18, 20),     The brake pads (4, 6) arranged on each side of the brake disc (2)   The thickness reduction area (14) of the friction lining layers (10, 12)   , 16, 18, 20) are arranged asymmetrically with respect to the plane. 2. The brake discs (2) are arranged on opposite sides of the brake disc (2).   Includes two brake pads (4, 6) arranged to be able to press against the disc (2)   It is a brake pad set for disc brakes, and the brake pads (4, 6)   The carrier plate (8) and the friction lining layer (10, 1   2), and the friction lining layer (10, 12) has a reduced thickness region (14, 16, 18, 2).   0)     The brake pads (4, 6) arranged on each side of the brake disc (2)   The thickness reduction area (14) of the friction lining layers (10, 12)   , 16, 18, 20) are arranged asymmetrically with respect to the plane. 3. 3. The device according to claim 1, wherein the region has a reduced thickness.   Surface is circumscribed toward the carrier plate (8) and has an angle of about 10-45 °.   Extends downward in degrees. 4. The device according to any one of claims 1 to 3, wherein each brake pad (4,   6) is relative to a bisector (center line) extending in the radial direction of the brake disc (2).   A plurality of reduced thickness regions (14, 16, 18, 20) are provided at symmetric positions. 5. The apparatus according to any one of claims 1 to 3, wherein the thickness reduction region (14, 16, 1) is provided.   8 and 20) are provided at least at one end of the brake pads (4 and 6).   It is arranged in the tangential direction of the disc (2). 6. The device according to any one of claims 1 to 3, wherein each brake pad (4,   6) is a central region (22) in which the thickness of the friction lining layer is constant, and at least   Also located at one end of the brake pads (4, 6) and tangential to the brake disc (2)   And reduced thickness regions (14, 16, 18, 20). 7. 7. The device according to claim 6, wherein the central region (22) and the reduced thickness regions (14, 16).   , 18, 20) is defined by the radiation of the brake disc (2).   ± 0-60 ° to the bisector (28) of the brake pad (4,6) extending in the direction   Extend at an angle, preferably ± 10-30 °. 8. The apparatus according to any one of claims 1 to 7, wherein the thickness reduction region (14, 16, 1) is provided.   8, 20), with respect to the rotation direction of the brake disc (2),   6) is disposed at the discharge side end (30, 32).